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Time to bust the myth?
  1. Roy J Shephard
  1. Correspondence to Professor Roy J Shephard, Faculty of Physical Education and Health, University of Toronto, P.O. Box 521, Brackendale, Ontario, Canada BC V0N 1H0; royjshep{at}

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Recent editorials have renewed the debate over the possible contribution of a secular decrease in habitual physical activity to the current obesity epidemic.1 ,2 In arguing against the role of physical inactivity, Malhotra et al 1 cite a widely criticised opinion piece3 ,4 suggesting there has been “little change of physical activity levels in the past 30 years.” Blair2 counters that although leisure activity may not …

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  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.